You can always create an Avatar that looks just like an 'I like Fryke' badge (which even rhymes!) ;-)
No, I don't think member2member rating would add any real value to the forums. The members themselves can decide very well whether an answer to a specific problem they have is accurate/good whatever... And even the worst user who usually only spoils the fun of others can have a bright idea and help someone out once in a while, so what good would a bad rating of him/her be to other users?
My question is also: Under which circumstances would members usually actually _do_ rate other members? My personal opinion: Members would have the tendency to actually _do_ rate other members when they're p**d off by another member. Which would, overall, lead to mostly bad ratings. Which isn't exactly helpful, is it.